Stabilization of neoclassical tearing modes using a continuous localized current drive
نویسندگان
چکیده
منابع مشابه
Complete stabilization of neoclassical tearing modes with lower hybrid current drive on COMPASS-D. RF teams.
Lower hybrid current drive (LHCD) with modest powers ( approximately 10% of the total power input) has been used for the first time to completely stabilize performance limiting neoclassical tearing modes in many COMPASS-D tokamak discharges. The stabilizing effect in these experiments is consistent with a reduction in the free energy available in the current profile to drive tearing modes (i.e....
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The system planned for electron cyclotron current drive (ECCD) in ITER can mitigate the deleterious effects of neoclassical tearing modes (NTMs) provided that adequate alignment of the ECCD to the rational surface is maintained or too large a misalignment is corrected on a time scale shorter than the plasma response to “large” islands. Resistive neoclassical tearing modes (NTMs) will be the pri...
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Numerical simulation results for the nonlinear evolution of neoclassical tearing modes (NTMs) and the stabilization of NTMs by localized RF current drive are presented. It is shown that the saturated island width does not increase linearly with the local bootstrap current density fraction. The NTMs are found to be stabilized by a localized RF current drive, if a sufficiently large RF current is...
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The effect of an equilibrium sheared ow on the nonlinear evolution of a neoclassical tearing mode is investigated by estimating the inuence it has on the inner and outer layer dynamics of the mode. Two complementary approaches are adopted. A generalized Rutherford model calculation is carried out to estimate the ow contributions to the polarization current term in the inner layer. For the ou...
متن کاملTH-S Partial Stabilization and Control of Neoclassical Tearing Modes in Burning Plasmas
Neoclassical tearing modes (NTMs) are magnetic islands which increase locally the radial transport and therefore degrade the plasma performance. They are self-sustained by the bootstrap current perturbed by the enhanced radial transport. The confinement degradation is proportional to the island width and to ρs, where ρs is the position of the resonant surface. Therefore the q=2 NTMs are much mo...
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ژورنال
عنوان ژورنال: Physics of Plasmas
سال: 1999
ISSN: 1070-664X,1089-7674
DOI: 10.1063/1.873412